---
title: customDetailSpecification
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/photogrammetrysession/configuration-swift.struct/customdetailspecification-swift.property
---

# customDetailSpecification

Defines custom detail level specifications for a photogrammetry session with custom detail level.

## Declaration

```swift
var customDetailSpecification: PhotogrammetrySession.Configuration.CustomDetailSpecification
```

## Discussion

Discussion This property configures the characteristics of the model’s precision and characteristics, such as texture size and the types of texture maps. important: The system checks this property only when processing a request with the PhotogrammetrySession.Request.Detail.custom detail set.